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We experimentally investigated the splashing of dense suspension dropletsimpacting a solid surface, extending prior work to the regime where theviscosity of the suspending liquid becomes a significant parameter. The overallbehavior can be described by a combination of two trends. The first one is thatthe splashing becomes favored when the kinetic energy of individual particlesat the surface of a droplet overcomes the confinement produced by surfacetension. This is expressed by a particle-based Weber number $We_p$. The secondis that splashing is suppressed by increasing the viscosity of the solvent.This is expressed by the Stokes number $St$, which influences the effectivecoefficient of restitution of colliding particles. We developed a phase diagramwhere the splashing onset is delineated as a function of both $We_p$ and $St$.A surprising result occurs at very small Stokes number, where not onlysplashing is suppressed but also plastic deformation of the droplet. This leadsto a situation where droplets can bounce back after impact, an observation weare able to reproduce using discrete particle numerical simulations that takeinto account viscous interaction between particles and elastic energy.

From splashing to bouncing: the influence of viscosity on the impact of suspension droplets on a solid surface